아날로그 및 디지털 회로 설계 실습 결과보고서4 신호발생기

본 내용은 " 아날로그 및 디지털 회로 설계 실습 결과보고서4 신호발생기 " 의 원문 자료에서 일부 인용된 것입니다. 2023.09.07

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• 1. Wien bridge oscillator

  이번 실험에서는 Wien bridge oscillator를 구현하고 op amp의 gain 값을 변화시켜가며 출력파형과 frequency를 확인하였다. 발진주파수와 그때의 파형을 확인하였고, 추가적으로 저항과 다이오드를 병렬 연결하여 파형의 안정화를 확인하였다. 실험 결과 대체로 계획서에서 목표한 바와 가까운 값이 도출되었으나, 출력전압의 최댓값과 frequency 값이 약 10% 정도 낮게 나왔다. 이는 op amp 내부 저항 등의 문제로 인해 이론상 15V보다 낮은 13~14V가 출력되었기 때문이다. 전체적으로 실습은 잘 되었으며, negative feedback 과정에서 다이오드를 병렬로 부착하면 파형의 왜곡을 줄일 수 있다는 점을 배웠다.

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• 1. Wien bridge oscillator

  The Wien bridge oscillator is a type of electronic oscillator circuit that generates a sinusoidal waveform. It is widely used in various applications, such as audio equipment, test and measurement instruments, and communication systems. The key feature of the Wien bridge oscillator is its ability to produce a stable and low-distortion output signal, making it a popular choice for applications that require a high-quality sine wave. The circuit consists of a feedback loop that includes a Wien bridge network, which is a combination of resistors and capacitors arranged in a specific configuration. This network provides the necessary phase shift and amplitude control to sustain oscillation at a specific frequency. The frequency of oscillation is determined by the values of the resistors and capacitors in the Wien bridge, allowing for easy tuning and adjustment. One of the main advantages of the Wien bridge oscillator is its simplicity and reliability. The circuit is relatively straightforward to design and implement, making it a cost-effective solution for many applications. Additionally, the Wien bridge oscillator is known for its low output impedance, which allows it to drive various loads without significant distortion or loading effects. However, the Wien bridge oscillator also has some limitations. It can be susceptible to temperature and component variations, which can affect the stability and accuracy of the output signal. To address this, various techniques, such as the use of thermistors or automatic gain control circuits, have been developed to improve the overall performance and stability of the oscillator. Overall, the Wien bridge oscillator remains a widely used and important circuit in the field of electronic design and instrumentation. Its ability to generate a high-quality sine wave, combined with its simplicity and reliability, make it a valuable tool for a wide range of applications.